From: Hidetoshi NAGAI <nagai@...>
Date: 2005-12-02T16:31:34+09:00
Subject: Re: Ruby TK GUI questions

From: "Harry Truax" <htruax@stf.com>
Subject: Ruby TK GUI questions
Date: Fri, 2 Dec 2005 04:24:29 +0900
Message-ID: <200512011424320.SM00796@htruax>
> 1) I setup a Listbox widget, and inserted 4 lines of text into it. The user
> clicks on any one of the elements of the list, which always holds the four
> possible selections. My question is, how do I get the active list element to
> display with the highlighting appearance you would see as if it was clicked
> on by the user?

  listbox_widget.curselection

It returns an array containing the numerical indices of 
the selected elements.

>                 Right now, my list appears with no selected item until
> someone clicks on an item - I want the Listbox to be created at startup,
> filled with the selections, and then have the currently active element
> displayed in the same manner it would appear if it was clicked on. I know
> how to set one of the four selections to be the active item, but I want the
> user to 'see' this via the highlighting.

  listbox_widget.selectmode('multiple')
  listbox_widget.selection_clear(0, :end)
  [1,2].each{|idx| listbox_widget.selection_set(idx)}

    or, if want to set all,

  listbox_widget.selection_set(0, :end)

> 2) Another portion of my project writes some text to a text widget. How do I
> set the cursor in the text widget at the first char position after the
> insertion is done? I know how to set the focus to that text widget, but the
> cursor is at the end of the inserted text, I want to put the cursor at the
> first line, first character position.

  text_widget.mark_set('insert', '1.0')

     or

  ins = TkTextMarkInsert.new(text_widget)
  ins.set('1.0')

In some case, the following is usefull.

  text_widget.mark_gravity('insert', :left)

-- 
Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)